MAGIC

Type Oceanographic cruise
Ship Pourquoi pas ?
Ship owner Ifremer
Dates 13/08/2012 - 20/09/2012
Chief scientist(s) ASLANIAN Daniel ORCID, MOULIN Maryline ORCID, SCHNURLE Philippe ORCID

GEO-OCEAN - UMR 6538

IFREMER - Technopôle Brest-Iroise

IUEM - Rue Dumont d'Urville

29280 Plouzané

https://www.geo-ocean.fr/
DOI 10.17600/12030090
Objective

The Equatorial Atlantic Ocean, extending over 2,000km, can be divided into 3 large 600-800km segments which are separated by major fracture zones (Ascension, Chain, São Paulo, Romanche and Sierra Leone). The aim of the MAGIC (acronym for Margins of brAzil, Ghana and Ivory Coast) project is to study the segment II (between the FZ of Romanche and São Paulo), and more specifically the Para-Maranhão-Barreirinhas-Ceara system and the Ivory Coast (Cote d'Ivoire) - Ghana margins. The proposal is to obtain complete cross-sections of this system, on the Brazilian side to begin with, to construct 3D imagery of its deep structure and test different hypotheses about: 1) the nature of the crust in the transition zone (between the continent-ocean boundary and fit). Why is it already thinned? Is this 20km crust made up purely of an upper crust? Is exhumed mantle present? 2) the position of the oceanic crust. When did the contact between the oceanic and continental/transitional crusts take place along the Romanche and São Paulo fracture zones? What are the consequences on subsidence? 3) subsidence (by modelling) 4) 3D deep evolution of the Ceara-Maranhão-Para system (with its conjugate margin, i.e. the Côte d'Ivoire-Ghana margin) in comparison with other margin systems 5) rifting models in oblique extension systems. The related project is MAGIC.

Data managed by SISMER

Sampling operations

Bibliography

Publications

Goncalves Susana, Schnürle PhilippeORCID, Rabineau MarinaORCID, Afilhado A., Aslanian DanielORCID, Moulin MarylineORCID, Evain MikaelORCID, Loureiro A., Dias N. (2023). Deep crustal structures with reverse time migration applied to offshore wide-angle seismic data: Equatorial and North-West Brazilian margins. Journal Of South American Earth Sciences, 128, 104398 (11p.). https://doi.org/10.1016/j.jsames.2023.104398


Schnurle PhilippeORCID, Gallais Flora, Afilhado A., Moulin MarylineORCID, Dias N.A., Soares J., Loureiro A., Fuck R., Cupertino J.A., Viana A., Aslanian DanielORCID (2023). Wide-angle seismic imaging of divergent and transform segments of the Pará-Maranhão-Barreirinhas-Ceará margin, NW Brazil. Journal Of South American Earth Sciences, 127, 104394 (20p.). https://doi.org/10.1016/j.jsames.2023.104394


Moulin MarylineORCID, Schnurle PhilippeORCID, Afilhado Alexandra, Gallais Flora, Dias Nuno, Evain MikaelORCID, Soares José, Fuck Reinhardt, Da Cruz Pessoa Neto Otaviano, Viana Adriano, Aslanian DanielORCID (2021). Imaging early oceanic crust spreading in the Equatorial Atlantic Ocean: Insights from the MAGIC wide-angle experiment. Journal Of South American Earth Sciences, 111, 103493 (20p.). Publisher's official version : https://doi.org/10.1016/j.jsames.2021.103493 , Open Access version : https://archimer.ifremer.fr/doc/00709/82119/


Aslanian DanielORCID, Gallais Flora, Afilhado Alexandra, Schnurle PhilippeORCID, Moulin MarylineORCID, Evain MikaelORCID, Dias Nuno, Soares Jose, Fuck Reinhart, Da Cruz Pessoa Neto Otaviano, Viana Adriano (2021). Deep structure of the Pará-Maranhão/Barreirinhas passive margin in the equatorial Atlantic (NE Brazil). Journal Of South American Earth Sciences, 110, 103322 (23p.). Publisher's official version : https://doi.org/10.1016/j.jsames.2021.103322 , Open Access version : https://archimer.ifremer.fr/doc/00690/80240/